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1 files changed, 383 insertions, 0 deletions

diff --git a/libjava/classpath/java/awt/dnd/DragSourceContext.java b/libjava/classpath/java/awt/dnd/DragSourceContext.java
new file mode 100644
index 000000000..e21b4fdae
--- /dev/null
+++ b/libjava/classpath/java/awt/dnd/DragSourceContext.java
@@ -0,0 +1,383 @@
+/* DragSourceContext.java --
+   Copyright (C) 2002 Free Software Foundation
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package java.awt.dnd;
+
+import java.awt.Component;
+import java.awt.Cursor;
+import java.awt.Image;
+import java.awt.Point;
+import java.awt.datatransfer.Transferable;
+import java.awt.dnd.peer.DragSourceContextPeer;
+import java.io.Serializable;
+import java.util.TooManyListenersException;
+
+/**
+ * @since 1.2
+ */
+public class DragSourceContext
+  implements DragSourceListener, DragSourceMotionListener, Serializable
+{
+  /**
+   * Compatible with JDK 1.2+
+   */
+  static final long serialVersionUID = -115407898692194719L;
+
+  protected static final int DEFAULT = 0;
+  protected static final int ENTER = 1;
+  protected static final int OVER = 2;
+  protected static final int CHANGED = 3;
+
+  private DragSourceContextPeer peer;
+  private Cursor cursor;
+  private Transferable transferable;
+  private DragGestureEvent trigger;
+  private DragSourceListener dragSourceListener;
+  private boolean useCustomCursor;
+  private int sourceActions;
+  private Image image;
+  private Point offset;
+
+  /**
+   * Initializes a drag source context.
+   *
+   * @exception IllegalArgumentException If Component or DragSource of trigger
+   * are null, the drag action for the trigger event is DnDConstants.ACTION_NONE
+   * or if the source actions for the DragGestureRecognizer associated with the
+   * trigger event are equal to DnDConstants.ACTION_NONE.
+   * @exception NullPointerException If peer, trans or trigger is null or if the
+   * image is not null but the offset is.
+   */
+  public DragSourceContext (DragSourceContextPeer peer,
+                            DragGestureEvent trigger, Cursor cursor,
+                            Image image, Point offset, Transferable trans,
+                            DragSourceListener dsl)
+  {
+    if (peer == null
+        || trigger == null || trans == null
+        || (image != null && offset == null))
+      throw new NullPointerException ();
+
+    if (trigger.getComponent () == null
+        || trigger.getDragSource () == null
+        || trigger.getDragAction () == DnDConstants.ACTION_NONE
+        || trigger.getSourceAsDragGestureRecognizer ()
+              .getSourceActions () == DnDConstants.ACTION_NONE)
+      throw new IllegalArgumentException ();
+
+    this.peer = peer;
+    this.trigger = trigger;
+    this.cursor = cursor;
+    this.image = image;
+    this.offset = offset;
+    this.transferable = trans;
+    this.dragSourceListener = dsl;
+    this.sourceActions = trigger.getSourceAsDragGestureRecognizer().getSourceActions();
+
+    setCursor(cursor);
+    updateCurrentCursor(trigger.getDragAction(), sourceActions, DEFAULT);
+  }
+
+  /**
+   * Returns the DragSource object associated with the
+   * DragGestureEvent.
+   *
+   * @return the DragSource associated with the trigger.
+   */
+  public DragSource getDragSource()
+  {
+    return trigger.getDragSource ();
+  }
+
+  /**
+   * Returns the component associated with this.
+   *
+   * @return the component associated with the trigger.
+   */
+  public Component getComponent()
+  {
+    return trigger.getComponent ();
+  }
+
+  /**
+   * Gets the trigger associated with this.
+   *
+   * @return the trigger.
+   */
+  public DragGestureEvent getTrigger()
+  {
+    return trigger;
+  }
+
+  /**
+   * Returns the source actions for the DragGestureRecognizer.
+   *
+   * @return the source actions for DragGestureRecognizer.
+   */
+  public int getSourceActions()
+  {
+    if (sourceActions == 0)
+      sourceActions = trigger.getSourceAsDragGestureRecognizer().getSourceActions();
+    return sourceActions;
+  }
+
+  /**
+   * Sets the cursor for this drag operation to the specified cursor.
+   *
+   * @param cursor c - the Cursor to use, or null to use the default drag
+   *          cursor.
+   */
+  public void setCursor(Cursor cursor)
+  {
+    if (cursor == null)
+      useCustomCursor = false;
+    else
+      useCustomCursor = true;
+    this.cursor = cursor;
+    peer.setCursor(cursor);
+  }
+
+  /**
+   * Returns the current cursor or null if the default
+   * drag cursor is used.
+   *
+   * @return the current cursor or null.
+   */
+  public Cursor getCursor()
+  {
+    return cursor;
+  }
+
+  /**
+   * Adds a <code>DragSourceListener</code>.
+   *
+   * @exception TooManyListenersException If a <code>DragSourceListener</code>
+   * has already been added.
+   */
+  public void addDragSourceListener (DragSourceListener dsl)
+    throws TooManyListenersException
+  {
+    if (dragSourceListener != null)
+      throw new TooManyListenersException ();
+
+    dragSourceListener = dsl;
+  }
+
+  public void removeDragSourceListener (DragSourceListener dsl)
+  {
+    if (dragSourceListener == dsl)
+      dragSourceListener = null;
+  }
+
+  /**
+   * This function tells the peer that the DataFlavors have been modified.
+   */
+  public void transferablesFlavorsChanged()
+  {
+    peer.transferablesFlavorsChanged();
+  }
+
+  /**
+   * Calls dragEnter on the listeners registered with this
+   * and with the DragSource.
+   *
+   * @param e - the DragSourceDragEvent
+   */
+  public void dragEnter(DragSourceDragEvent e)
+  {
+    if (dragSourceListener != null)
+      dragSourceListener.dragEnter(e);
+
+    DragSource ds = getDragSource();
+    DragSourceListener[] dsl = ds.getDragSourceListeners();
+    for (int i = 0; i < dsl.length; i++)
+      dsl[i].dragEnter(e);
+
+    updateCurrentCursor(e.getDropAction(), e.getTargetActions(), ENTER);
+  }
+
+  /**
+   * Calls dragOver on the listeners registered with this
+   * and with the DragSource.
+   *
+   * @param e - the DragSourceDragEvent
+   */
+  public void dragOver(DragSourceDragEvent e)
+  {
+    if (dragSourceListener != null)
+      dragSourceListener.dragOver(e);
+
+    DragSource ds = getDragSource();
+    DragSourceListener[] dsl = ds.getDragSourceListeners();
+    for (int i = 0; i < dsl.length; i++)
+      dsl[i].dragOver(e);
+
+    updateCurrentCursor(e.getDropAction(), e.getTargetActions(), OVER);
+  }
+
+  /**
+   * Calls dragExit on the listeners registered with this
+   * and with the DragSource.
+   *
+   * @param e - the DragSourceEvent
+   */
+  public void dragExit(DragSourceEvent e)
+  {
+    if (dragSourceListener != null)
+      dragSourceListener.dragExit(e);
+
+    DragSource ds = getDragSource();
+    DragSourceListener[] dsl = ds.getDragSourceListeners();
+    for (int i = 0; i < dsl.length; i++)
+      dsl[i].dragExit(e);
+
+    updateCurrentCursor(DnDConstants.ACTION_NONE, DnDConstants.ACTION_NONE,
+                        DEFAULT);
+  }
+
+  /**
+   * Calls dropActionChanged on the listeners registered with this
+   * and with the DragSource.
+   *
+   * @param e - the DragSourceDragEvent
+   */
+  public void dropActionChanged(DragSourceDragEvent e)
+  {
+    if (dragSourceListener != null)
+      dragSourceListener.dropActionChanged(e);
+
+    DragSource ds = getDragSource();
+    DragSourceListener[] dsl = ds.getDragSourceListeners();
+    for (int i = 0; i < dsl.length; i++)
+      dsl[i].dropActionChanged(e);
+
+    updateCurrentCursor(e.getDropAction(), e.getTargetActions(), CHANGED);
+  }
+
+  /**
+   * Calls dragDropEnd on the listeners registered with this
+   * and with the DragSource.
+   *
+   * @param e - the DragSourceDropEvent
+   */
+  public void dragDropEnd(DragSourceDropEvent e)
+  {
+    if (dragSourceListener != null)
+      dragSourceListener.dragDropEnd(e);
+
+    DragSource ds = getDragSource();
+    DragSourceListener[] dsl = ds.getDragSourceListeners();
+    for (int i = 0; i < dsl.length; i++)
+      dsl[i].dragDropEnd(e);
+  }
+
+  /**
+   * Calls dragMouseMoved on the listeners registered with the DragSource.
+   *
+   * @param e - the DragSourceDragEvent
+   */
+  public void dragMouseMoved(DragSourceDragEvent e)
+  {
+    DragSource ds = getDragSource();
+    DragSourceMotionListener[] dsml = ds.getDragSourceMotionListeners();
+    for (int i = 0; i < dsml.length; i++)
+      dsml[i].dragMouseMoved(e);
+  }
+
+  /**
+   * Returns the Transferable set with this object.
+   *
+   * @return the transferable.
+   */
+  public Transferable getTransferable()
+  {
+    return transferable;
+  }
+
+  /**
+   * This function sets the drag cursor for the specified operation, actions and
+   * status if the default drag cursor is active. Otherwise, the cursor is not
+   * updated in any way.
+   *
+   * @param dropOp - the current operation.
+   * @param targetAct - the supported actions.
+   * @param status - the status of the cursor (constant).
+   */
+  protected void updateCurrentCursor(int dropOp, int targetAct, int status)
+  {
+    if (! useCustomCursor)
+      {
+        Cursor newCursor = null;
+        switch (status)
+          {
+          default:
+            targetAct = DnDConstants.ACTION_NONE;
+          case ENTER:
+          case CHANGED:
+          case OVER:
+            int action = dropOp & targetAct;
+            if (action == DnDConstants.ACTION_NONE)
+              {
+                if ((dropOp & DnDConstants.ACTION_LINK) != 0)
+                  newCursor = DragSource.DefaultLinkNoDrop;
+                else if ((dropOp & DnDConstants.ACTION_MOVE) != 0)
+                  newCursor = DragSource.DefaultMoveNoDrop;
+                else
+                  newCursor = DragSource.DefaultCopyNoDrop;
+              }
+            else
+              {
+                if ((dropOp & DnDConstants.ACTION_LINK) != 0)
+                  newCursor = DragSource.DefaultLinkDrop;
+                else if ((dropOp & DnDConstants.ACTION_MOVE) != 0)
+                  newCursor = DragSource.DefaultMoveDrop;
+                else
+                  newCursor = DragSource.DefaultCopyDrop;
+              }
+          }
+
+        if (cursor == null || ! cursor.equals(newCursor))
+          {
+            cursor = newCursor;
+            DragSourceContextPeer p = peer;
+            if (p != null)
+              p.setCursor(cursor);
+          }
+      }
+  }
+} // class DragSourceContext